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The deformation and high grade metamorphism responsible for the tectonic inversion of the sedimentary basin is attributed to an orogenic event of Cambrian age. Schmitt et al. (200cuatro Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Pimentel M.M. 2004. Late amalgamation in the central part of West Gondwana: new geochronological data and the characterization of a Cambrian collisional orogeny in the Ribeira Belt (SE Brazil). Precambrian Research , -61. , 2008b Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Passchier C.W. 2008b. Cambrian orogeny in the Ribeira Belt (SE Brazil) and correlations within West Gondwana: ties that bind underwater. : Pankhurst R.J., Trouw R.A.J., Brioto Neves B.B., De Wit M.J. (eds.) West Gondwana: Pre-Cenozoic Correlations across the South Atlantic Region . Geological Society, London , Special Publications, -296. ) dated the D1+2 syntectonic leucosome from both basement and supracrustals, and defined a ca. 530 Ma tectonometamorphic event related to a convergent margin that culminated with a continental collision (Buzios Orogeny). This partial melt product was generated during the metamorphic peak (D1+dos) and was folded by the megascale F3-folds ( Fig. 4E).
Even in the event one of those plutons get across-slice the CFTD in NW tip, the latest Silva Jardim Pluton, old from the 505 Ma ( Figs
In the basement, the lower intercepts of the U-Pb discordia lines are in the interval between 600 and 450 Ma, consistent with this event ( Schmitt et al. 2004 Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Pimentel M.M. 2004. Late amalgamation in the central part of West Gondwana: new geochronological data and the characterization of a Cambrian collisional orogeny in the Ribeira Belt (SE Brazil). Precambrian Research , -61. , 2008b Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Passchier C.W. 2008b. Cambrian orogeny in the Ribeira Belt (SE Brazil) and correlations within West Gondwana: ties that bind underwater. : Pankhurst R.J., Trouw R.A.J., Brioto Neves B.B., De Wit M.J. (eds.) West Gondwana: Pre-Cenozoic Correlations across the South Atlantic Region . Geological Society, London , Special Publications, -296. ). The metamorphic rims of the Paleoproterozoic zircon grains in the shear zones are dated at ca. 505 Ma ( Schmitt et al. 2008b Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Passchier C.W. 2008b. Cambrian orogeny in the Ribeira Belt (SE Brazil) and correlations within West Gondwana: ties that bind underwater. : Pankhurst R.J., Trouw R.A.J., Brioto Neves B.B., De Wit M.J. (eds.) West Gondwana: Pre-Cenozoic Correlations across the South Atlantic Region . Geological Society https://www.datingmentor.org/pl/introwertyk-randki/, London , Special Publications, -296. ). In the supracrustals, all metamorphic minerals are formed during the Cambrian (ca. 530 Ma). Zircon, monazite, sphene and rutile were dated and yielded a metamorphic time interval between 525 and 510 Ma for the eastern CFTD and 505 – 490 Ma for the western CFTD ( Schmitt et al. 2004 Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Pimentel M.M. 2004. Late amalgamation in the central part of West Gondwana: new geochronological data and the characterization of a Cambrian collisional orogeny in the Ribeira Belt (SE Brazil). Precambrian Research , -61. ). The occurrence of a late F4-reclined megascale fold in the western region could partially explain this ( Fig. 3). These younger ages could indicate that units in this region stayed deeper in the crust and the D4 deformational phase would bring them up later. The cooling rate calculated for the eastern part of CFTD is rapid until ca. 510 Ma (more than 20 o C/Ma), and after this diminishes to 5 – 10 o C/Ma ( Schmitt et al., 2004 Schmitt R.S., Trouw R.A.J., Van Schmus W.R., Pimentel M.M. 2004. Late amalgamation in the central part of West Gondwana: new geochronological data and the characterization of a Cambrian collisional orogeny in the Ribeira Belt (SE Brazil). Precambrian Research , -61. ).
In the surrounding Oriental Terrane ( Figs. dos and you will 3), there are also metamorphic ages of california. 550 – 510 Ma ( Schmitt et al. 2004 Schmitt Roentgen.S., Trouw R.A.J., Van Schmus W.Roentgen., Pimentel Yards.Yards. 2004. Late amalgamation in the central element of West Gondwana: the brand new geochronological studies therefore the characterization out-of a great Cambrian collisional orogeny throughout the Ribeira Belt (SE Brazil). Precambrian Look , -61. , 2012a Schmitt R.S., Mendes J.C., Peternel Roentgen., Silva L.C., Dantas Elizabeth.L. 2012a. : SSAGI, Medellin, Colombia. ; Fernandes ainsi que al. 2015 Fernandes Grams.L., Schmitt Roentgen.S., Bongiolo Age., Mendes J.C., Basei Yards. 2015. Unraveling brand new tectonic progression off a beneficial Neoproterozoic-Cambrian energetic margin on Ribeira Orogen (SE Brazil): U-Pb and Lu-Hf provenance investigation. Precambrian Lookup , -360. ). Also, several plutons which have age away from 510 so you can 480 Ma intrude it terrane and tend to be interpreted because the blog post-tectonic ( Valeriano ainsi que al. 2011 Valeriano C.M., Tupinamba Meters., Simonetti A good., Heilbron M., Almeida J.C.H., Eirado L.G. 2011. U-Pb La-MC-ICPMS geochronology from Cambro-Ordovician post-collisional granites of your Ribeira gear, southeast Brazil: terminal Brasiliano magmatism in the central Gondwana supercontinent. Log off Southern American World Sciences , -428. ). 2 and you will step three) ( Moraes 2009 Moraes J.Meters. 2009. Geologia do Granito Silva Jardim (RJ): Implicacoes na evolucao tectonica 2 Terrenos Oriental age Cabo Frio. Learn Thesis UERJ. 65 p. ). That it pluton presents a situated igneous foliation in fact it is felt an effective late-collisional magmatic looks ( Moraes 2009 Moraes J.M. 2009. Geologia manage Granito Silva Jardim (RJ): Implicacoes na evolucao tectonica dos Terrenos China elizabeth Cabo Frio. Learn Thesis UERJ. 65 p. ). The newest youngest magmatic intrusions entered regarding the CFTD when you look at the Paleozoic is actually blog post tectonic pegmatites and you can granites of ca. 440 Ma dated which have You-Pb when you look at the zircon ( Schmitt mais aussi al. 2004 Schmitt Roentgen.S., Trouw R.A good.J., Van Schmus W.Roentgen., Pimentel Yards.M. 2004. Later amalgamation throughout the main section of West Gondwana: the newest geochronological investigation therefore the characterization from a good Cambrian collisional orogeny on the Ribeira Strip (SE Brazil). Precambrian Browse , -61. , Bongiolo et al. 2015 Bongiolo E., Renac C., D’Almeida de- Toledo P., Schmitt Roentgen.S., Faulstich F.R.L., Mexias , Silva F.P.C. 2015. Supply of pegmatites and you may liquids during the Ponta Negra (RJ, Brazil) throughout the late- to share-collisional levels of your Gondwana Installation. Lithos , -275. ).